# Knowles THORP T-18

- Type: Aircraft model (FAA registry)
- Registry code: 89510BQ
- Manufacturer (registry): KNOWLES
- Model: THORP T-18
- Aircraft type: Fixed wing single engine
- Category: Airplane
- Engines: 1 · Reciprocating
- Seats: 2
- Weight class: Up to 12,499 lb
- Cruise speed: 97 mph
- Certification: Not type certificated
- Registered aircraft: 0
- Page: https://openairdocs.org/model/knowles-thorp-t-18

Model codes come from the FAA registry's reference file. ADs are matched to them by model name and maker.

## ADs that may apply (OpenAirDocs)

Matched to this model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment.

None matched.

## Registered aircraft

None registered with this model now.

## NTSB investigations (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB LAX89DVG02](https://openairdocs.org/ntsb/LAX89DVG02), Dec 4, 1988: Knowles Thorp T-18 (N77KK), Lincoln, CA, substantial damage

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 19881204052539A](https://openairdocs.org/incident/19881204052539A), Dec 4, 1988: Amtrth THORPT18 (N77KK), Lincoln, CA, Substantial damage. Veered off runway on landing and nosed over. Blamed locked brake. None found.

## Service difficulty reports (2)

As reported by operators and repair stations, by the model named in the report.

- [SDR 96ZZZX253](https://openairdocs.org/sdr/96ZZZX253), Nov 1, 1995: COOLER. SPLIT. OIL COOLER WELD BROKE WHERE THE BOSS IS WELDED ONTO THE COOLER ON INBOARD SIDE. OIL WAS QUICKLY PUMPED OUT OF THE ENGINE SPRAYING OVER THE ENGINE CREATING MUCH 
- [SDR 96ZZZX1095](https://openairdocs.org/sdr/96ZZZX1095), Oct 18, 1995: SPINNER. FAILED. EXPERIMENTAL AIRCRAFT, ON RUN-UP, AT FULL RPM - PROPELLER SPINNER SPLIT INTO 3 PIECES, 2 LARGE PIECES LEFT AIRCRAFT. COULD NOT BE FOUND. AIRCRAFT ENGINE SHUT DO

## The same model under other registry codes

Amateur-built copies and renamed makers get their own codes.

- [Hymen THORP T-18](https://openairdocs.org/model/hymen-thorp-t-18): 2 registered aircraft, registry code 8951037
- [Dean THORP T-18](https://openairdocs.org/model/dean-thorp-t-18): 2 registered aircraft, registry code 8951099
- [Broussard Donald G THORP T-18](https://openairdocs.org/model/broussard-donald-g-thorp-t-18): 1 registered aircraft, registry code 05601GV
- [Miller J G/Miller S/Miller J A THORP T-18](https://openairdocs.org/model/miller-j-g-miller-s-miller-j-a-thorp-t-18): 1 registered aircraft, registry code 05601OG
- [Eklund Richard D THORP T-18](https://openairdocs.org/model/eklund-richard-d-thorp-t-18): 1 registered aircraft, registry code 05603DP
- [Waxenfelter Jack G THORP T-18](https://openairdocs.org/model/waxenfelter-jack-g-thorp-t-18): 1 registered aircraft, registry code 05603U6
- [Irving Steven THORP T-18](https://openairdocs.org/model/irving-steven-thorp-t-18): 1 registered aircraft, registry code 0560486
- [Borden Charles R THORP T-18](https://openairdocs.org/model/borden-charles-r-thorp-t-18): 1 registered aircraft, registry code 05605A4
- [Gardner William R THORP T-18](https://openairdocs.org/model/gardner-william-r-thorp-t-18): 1 registered aircraft, registry code 05606K3
- [Batchelor Mark S THORP T-18](https://openairdocs.org/model/batchelor-mark-s-thorp-t-18): 1 registered aircraft, registry code 05607US
- [Keyt Richard C THORP T-18](https://openairdocs.org/model/keyt-richard-c-thorp-t-18): 1 registered aircraft, registry code 056109Q
- [Palumbo Nathan M THORP T-18](https://openairdocs.org/model/palumbo-nathan-m-thorp-t-18): 1 registered aircraft, registry code 05611PO

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